Skiving-machine.



W. A. PARMENTER L A. B. ALBEN.

SKIVING MACHINE.

APPLICATION FILED owls, 1910.

Patented Aug. 13, 1912.

2 SHEETS-SHEET 1.

`W. A. PARMENTER & A. B. ALBEN.

SKIVING MACHINE.

APPLICATION FILED owls, 1910.

'wwf/@yf puniTnn sTATns PATENT onnicn WILLIAM A. PARMENTEB. AND .RTHURB. ALBEN, O-F BRO'C'KTDN, MASSACHUSETTS,

ASSIGNORS OF 'SE'I'TS ONE-THIRD T0 CHARLES S. IPIEBCE,v QF BBOCKTON,MASSACHU- SEWING-MACHINE.

Specification of Letters Patent.

have invented a certain new and useful Improvement in Skiving-Machines,of which( the following -is a specification, reference being had thereinto the accompanying drawings. g

Our present. invention relates to skiving machines of the type in whicha cylindrical or ring knife is employed. Such a machine is shown anddescribed in our prior Patent, No. QMAOB, dated December 21, 1909.

The machine embodying our invention is intended particularly for use onwork having sharp curves which cannot be skived entirely satisfactorilyon machines as heretofore constructed. It is also adapted partifcularlyfor use on thin unresisting material such as felt, paper kid and softleather'.

In the use of machines =of't his type, as

heretofore constructed, the chief diliculty has arisen from `thetendency of the knife to cut a wavy scarf or even to nick the scarf orto clip off the last corner. This tendency has not been so apparent whenthe machine has been used on straight work or upon stiff or resistingmaterial, but when it has been attempted to employ the machine to skivesoft material or upon work having sharp curves or angles, this tendencyof the machine ias been so great as to causeserious loss and to make ituneconomical to use the machine for this class of work. The machineembodying our present invention is, however, so constructed that it ispossible to skive satisfactorily very sharp curves and angles, and evenboth sides and the end' of a slit; and also to skive very unresis'tingmaterial, such as felt and the like.-

The present invention also includes lmore means for .adjusting thefeeding instrumentalities relativelyto each other.

The invention will be fully understood from the following descriptiontaken in vconnection with .the accompanying drawings, and the novelfeatures are pointed out and clearly defined in the vclaims at the closeof the specification.

In the drawings,-Figure l is a plan view of a machine embodying ourpresent .invention. Fig. 2 is an end elevation ofthe manal section of.the feed wheel. Fig. l1.- isfav view in perspective showing therelation ofk which supports the 'ro-'1 to the :edge of the cylinf theadjustab tating feed guide, dr'ical knife. Fig. 5 is a detail of thersame parts, being Aa section taken on line =5-5,

Referring now to the drawings-the table or frame of the machine is shownat A in e arm,

t B is shown the cylindrical knife 'which is secured to the shaft C androtates therewith. The said shaft 'C is adjustable longitudinally bymeans of the nut D and collar E so that the-edge ofthe knife B may bemoved forward or backward to'eXaetly the rig t point `with relation to'the feeding mechanism. The said feeding mechanism consists of a knurledfeed wheel G located interiorly Iof the knife and a rotating feed guideH located above the feed Wheel G and coperating therewith. The knurledfeed wheel G is of peculiar shape, being vof very much smaller diameterat `one lend than at the other and having a contour,` such that whenrevolved it presents its surface at a distance from the edge Vof theknife which distance is substantially equal at all poi-nts between theknife and the feed wheel. In other words, if a section be taken throughthe feed wheel on the plane in which the edge of the knife lies thecontour of the feed Fig. 1. f

Patented Aug. 13.1912. A y Application filed October 18, 1910.Serial'No. .587,739. i

wheel in this section will correspond with A a portion of the edgeof theknife. The shape of the feed wheel is plainly seen from Figs. 2 and 3.The knurled feed wheel -Gr is 'positively rotated upon a shaft I bymeans of worm and gear L and M, the said worm being mounted on a shaft Nhaving at its rear end a bel-t pulley O driven from a similar beltpulley P on the main shaft C. The mushroom shaped feed wheel G issecured vto a sleeve 50 by means of a projecttion or lug 51 engaging aslot 52 which is cut in the end of the sleeve 50. The said feed roll Gis held in contact with the sleeve 50 by means of the screw 53 whichengages the -end of the nonrotating shaft I -upon which the sleeve 50rotates. I

wheel is at an angletojthe ver-tical plane in which the edge of theknife lies as will befseen in Figs. -landl.- As will plainly be later'explained, this has an important ef 110 fect on the work produced. Thewheel may also be placed as shown at an angle to the horizoi'ital7 butwe do not consider this essential but only convenient as it keeps theshaft out of the way of the operators hands. It will also be seen thatthe effective surface of the feed wheel is at one side of a verticalline passing through the axis of the cylindrical knife, the said sidebeing that away from the main portion of the stock to be operated uponafter4 the manner described in our patent of the United States No.944,103, dated iecember 21, 1909, previously referred to.

Above the feed roll is located a rotating feed guide H supp'ortedin anadjustable arm 1S. The axis of rotation of the rotating feed guide l-lis somewhat inclined frointhey horizontal as shown in Fig. 2, and theconr n all parts.

cave surface of the said rotating feed guide corresponds withvthe convexsurface of the feed wheel G so that the work is carried forward betweenthe feed wheel and the feed guide with a substantially uniform pressurerihe adjustable arm 18 in which the rotating feed guide is supported i.rovided with a'depending abut-ment 19 :h is cut away on the side nextthe knife as s iown in Fig. i and is so constructed that it lies veryclose to the cutting edge of the knife. As previously stated, the knifeis adjustable slightly on its longitudinal axis so that is possible forthe operator to bring the edge of the knife very close to the abutmentand yet not strike the abutment when the knife rotates. l

We find that the placing of the feed wheel 1G an angle as describedherein results in improved work; We believe this to to the fact that thefeed wheel tends y the work slightly away from the i ment 19 andr thusto counteract the tendency of the knife to crowd the work against ltheabutment 19. By giving the aXis of the feed wheel substantially theinclination. 4iowa in Figs. 1 and 2, the tendencyrof the f d wheel tocarry the work away from the abutment is not sufficient to interferewith theproper guiding of the work/on'the t but servesto relievematerially re ofthe edge of the work against ent. As any pressure of theedge 'ir against the abutment tends to he edge of the work and to curlit up, ill be seen that the arrangement described assists the machinematerially in producing a smooth scarf.

it is of importance that the feed Wheel G and rotating feed guide H beadjusted tol each other and to the edge of the knife with lvery greatnicety as otherwise imperfect work is likely to be done. By this means,also, the thickness of the work at the scarf is determined. Forthis'purpose the shaft I is mounted on a rockshaft 21 carried inbearings in the frame of the machine. Another arm 22 depending therefromengages a screw 23 passing through a sleeve 24 and having at its outerend a thumb nut 25. A spring 26 is interposed between the arm 22 and theframe of the machine. This spring 26 serves 'to hold the arm 22 awayfrom the frame of the machine and consequently to hold the feed wheel Gupward against the inside of the knife with a yielding pressure, but thehead of the screw 23 prevents the feed wheel rising above apredetermined point which is adjustable by means of the thumb nut 25. Bythis construction the feed wheel .is'allowed to yield downwardly andthereby allow a bunch or thick spot in the shaving to pass through whileat the same Vtime producing a scarf of uniform thickreadily be adjustedby the thumb screw 32.- This construction holds the feed guide'so' thatit cannot yield upwardly .and is perfectly rigid so far as movementupwardly is concerned but at the same time makes it possible to adjustthe position slightly. lt will of course be understood that the anglewhich the rotating feed guide makes with the horizontal determines thewidth of the scarf. This adjustment is effected as just described. Thebracket 29 is adjustable vertically by means of the thumb screw 34 andthis adjustment determines the thickness of j the scarf at the edge.Said thumb screw 34;

engages-a lug 36 on the frame of the machine. A Sprin 361 tends' to holdthe said bracket up against the head of the thumb nut 34. The bracket 29may also be tilted about the point 38 by means of thethumb screw 39. Aspring 1-0 holds the bracket back against the end of the thumb screw 391The' system of adjustment' of the bracket 29 which has just beendescribed will be seen to be such thatthe rotating feed guide and arm 18are incapable of movement above a point determined by the variousadjustments but that the said rotating feed guide can' yield downwardlyslightly. The adjustment of .the position of the arm 18 by means of .the

thumb nut 32 determines the Width of the scarf. The scarf being widerthe more nearly parallel the contour of thefeed guide is to the contourof the feed roll. v

`What we claim is:

1. In amachine of the character described' the combination with acylindrical knife, of a feed wheell interiorly disposed with rela-- tionthereto, the axis of said feed Wheel beingr inclined to the plane inwhich the edge of the knife lies.

of the knife lies whereby the rotation of the feed Wheel tends tocounteract the tendency of the knife to crowd the Work against the 2. Ina machine of the character described, l abutment of the feed guide.

the combination ofa Cylindrical knife, a In testimony Whereoi1 We affixour signafeecl Wheel interiorly disposed with relation tures, inpresence of two Witnesses.

thereto, and a feed guide having an abut- VVLLIAM A. PARMENTER. mentadjacent the edge of the feed Wheel, ARTHUR B. ALBEN.

Suid cylindrical knife rotating toward said Vvlitnesses:

abutment, and smid feed Wheel having its GEORGE P. DIRE,

axis inclined to the plane in which the edge ALICE H. MORRISON.

